Gamma-ray Burst 130604A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 06:55:10 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.080d {+16h 40m 19s} (J2000),
                 250.077d {+16h 40m 18s} (current),
                 250.096d {+16h 40m 23s} (1950)
GRB_DEC:         +68.210d {+68d 12' 36"} (J2000),
                 +68.185d {+68d 11' 04"} (current),
                 +68.305d {+68d 18' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10971 [cnts]    Image_Peak=311 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   307     E_range: 50-350 keV
BKG_INTEN:       90304 [cnts]
BKG_TIME:        24813.36 SOD {06:53:33.36} UT
BKG_DUR:         40 [sec]
GRB_DATE:        16447 TJD;   155 DOY;   13/06/04
GRB_TIME:        24866.99 SOD {06:54:26.99} UT
GRB_PHI:         -168.07 [deg]
GRB_THETA:        30.86 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.36 [sigma]
IMAGE_SIGNIF:    7.99 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +3  -2  +0  +0  -1  +0 
SUN_POSTN:        72.46d {+04h 49m 51s}  +22.46d {+22d 27' 28"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.73d {+01h 30m 55s}  +11.60d {+11d 35' 56"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      158.76, 82.20 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 352.43,12.34 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 06:56:40 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.1929d {+16h 40m 46.29s} (J2000),
                 250.1890d {+16h 40m 45.35s} (current),
                 250.2097d {+16h 40m 50.32s} (1950)
GRB_DEC:         +68.2250d {+68d 13' 29.9"} (J2000),
                 +68.1997d {+68d 11' 58.8"} (current),
                 +68.3193d {+68d 19' 09.4"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.76e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.61 [sigma]
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  24966.26 SOD {06:56:06.26} UT,   99.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.21 261.61 243.51
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        72.46d {+04h 49m 51s}  +22.46d {+22d 27' 29"}
SUN_DIST:         89.33 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.74d {+01h 30m 58s}  +11.60d {+11d 36' 09"}
MOON_DIST:        93.40 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 36.99 [deg] galactic lon,lat of the burst
ECL_COORDS:      158.63, 82.24 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.66 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 06:56:54 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.1929d {+16h 40m 46.2s} (J2000),
                 250.1890d {+16h 40m 45.3s} (current),
                 250.2097d {+16h 40m 50.3s} (1950)
GRB_DEC:         +68.2250d {+68d 13' 29.9"} (J2000),
                 +68.1997d {+68d 11' 58.8"} (current),
                 +68.3193d {+68d 19' 09.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       58 [cnts]
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  24966.26 SOD {06:56:06.26} UT,   99.3 [sec] since BAT Trigger Time
CENTROID_X:      284.77,  raw= 285  [pixels]
CENTROID_Y:      228.40,  raw= 228  [pixels]
ROLL:            357.78 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -164.05
GRB_POS_XRT_Z:   -44.62
IMAGE_URL:       sw00557354000msxps_rw.img
SUN_POSTN:        72.46d {+04h 49m 51s}  +22.46d {+22d 27' 29"}
SUN_DIST:         89.33 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.74d {+01h 30m 58s}  +11.60d {+11d 36' 11"}
MOON_DIST:        93.40 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 36.99 [deg] galactic lon,lat of the burst
ECL_COORDS:      158.63, 82.24 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 06:56:58 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.1929d {+16h 40m 46.2s} (J2000),
                 250.1890d {+16h 40m 45.3s} (current),
                 250.2097d {+16h 40m 50.3s} (1950)
GRB_DEC:         +68.2250d {+68d 13' 29.9"} (J2000),
                 +68.1997d {+68d 11' 58.8"} (current),
                 +68.3193d {+68d 19' 09.4"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       58 [cnts]
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  24966.26 SOD {06:56:06.26} UT,   99.3 [sec] since BAT Trigger Time
CENTROID_X:      284.77,  raw= 285  [pixels]
CENTROID_Y:      228.40,  raw= 228  [pixels]
ROLL:            357.78 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -164.05
GRB_POS_XRT_Z:   -44.62
IMAGE_URL:       sw00557354000msxps_rw.img
SUN_POSTN:        72.46d {+04h 49m 51s}  +22.46d {+22d 27' 29"}
SUN_DIST:         89.33 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.74d {+01h 30m 59s}  +11.60d {+11d 36' 11"}
MOON_DIST:        93.40 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 36.99 [deg] galactic lon,lat of the burst
ECL_COORDS:      158.63, 82.24 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 06:58:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.080d {+16h 40m 19s} (J2000),
                 250.077d {+16h 40m 18s} (current),
                 250.096d {+16h 40m 23s} (1950)
GRB_DEC:         +68.210d {+68d 12' 36"} (J2000),
                 +68.185d {+68d 11' 04"} (current),
                 +68.305d {+68d 18' 17"} (1950)
GRB_DATE:        16447 TJD;   155 DOY;   13/06/04
GRB_TIME:        24866.99 SOD {06:54:26.99} UT
TRIGGER_INDEX:   307
GRB_PHI:         -168.07 [deg]
GRB_THETA:        30.86 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.36 [sigma]
IMAGE_SIGNIF:    7.99 [sigma]
LC_URL:          sw00557354000msb.lc
SUN_POSTN:        72.46d {+04h 49m 51s}  +22.46d {+22d 27' 29"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.75d {+01h 31m 01s}  +11.61d {+11d 36' 21"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      158.76, 82.20 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 352.43,12.34 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:00:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.069d {+16h 40m 17s} (J2000)
POINT_DEC:       +68.212d {+68d 12' 41"} (J2000)
ROLL:            357.778d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  24975.73 SOD {06:56:15.73} UT,   108.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     392021786
X_OFFSET:        1027 [pixels]
Y_OFFSET:        1105 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1187
Y_GRB_POS:       1265
BINNING_INDEX:   1
IM_URL:          sw00557354000msuni0119.fits
SUN_POSTN:        72.47d {+04h 49m 52s}  +22.46d {+22d 27' 30"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.78d {+01h 31m 06s}  +11.61d {+11d 36' 44"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:01:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.069d {+16h 40m 17s} (J2000)
POINT_DEC:       +68.212d {+68d 12' 41"} (J2000)
ROLL:            357.778d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  24975.73 SOD {06:56:15.73} UT,   108.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     392021786
X_OFFSET:        1027 [pixels]
Y_OFFSET:        1105 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1187
Y_GRB_POS:       1265
BINNING_INDEX:   1
IM_URL:          sw00557354000msuni0119.fits
SUN_POSTN:        72.47d {+04h 49m 52s}  +22.46d {+22d 27' 30"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.78d {+01h 31m 07s}  +11.61d {+11d 36' 48"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.04 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:07:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.077d {+16h 40m 19s} (J2000)
POINT_DEC:       +68.211d {+68d 12' 39"} (J2000)
POINT_ROLL:      357.786d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  25134.22 SOD {06:58:54.22} UT,   267.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.563
N_STARS:         25
X_OFFSET:        707 [pixels]
Y_OFFSET:        785 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1744 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00557354000msufc0267.fits
SUN_POSTN:        72.47d {+04h 49m 53s}  +22.46d {+22d 27' 32"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.83d {+01h 31m 19s}  +11.63d {+11d 37' 41"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:07:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.077d {+16h 40m 19s} (J2000)
POINT_DEC:       +68.211d {+68d 12' 39"} (J2000)
POINT_ROLL:      357.786d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  25134.22 SOD {06:58:54.22} UT,   267.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.563
N_STARS:         25
X_OFFSET:        707 [pixels]
Y_OFFSET:        785 [pixels]
X_MAX:           1666 [pixels]
Y_MAX:           1744 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00557354000msufc0267.fits
SUN_POSTN:        72.47d {+04h 49m 53s}  +22.46d {+22d 27' 32"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.83d {+01h 31m 20s}  +11.63d {+11d 37' 43"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:07:44 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     557354,   Seg_Num: 0
GRB_RA:          250.1888d {+16h 40m 45.31s} (J2000),
                 250.1849d {+16h 40m 44.37s} (current),
                 250.2056d {+16h 40m 49.34s} (1950)
GRB_DEC:         +68.2259d {+68d 13' 33.2"} (J2000),
                 +68.2006d {+68d 12' 02.0"} (current),
                 +68.3202d {+68d 19' 12.8"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  25095.00 SOD {06:58:15.00} UT,   228.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        72.47d {+04h 49m 53s}  +22.46d {+22d 27' 32"}
SUN_DIST:         89.32 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.83d {+01h 31m 20s}  +11.63d {+11d 37' 46"}
MOON_DIST:        93.40 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 36.99 [deg] galactic lon,lat of the burst
ECL_COORDS:      158.63, 82.24 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:08:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.077d {+16h 40m 19s} (J2000)
POINT_DEC:       +68.211d {+68d 12' 39"} (J2000)
ROLL:            357.786d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  25134.22 SOD {06:58:54.22} UT,   267.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     392021944
X_OFFSET:        1027 [pixels]
Y_OFFSET:        1105 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1187
Y_GRB_POS:       1265
BINNING_INDEX:   1
IM_URL:          sw00557354000msuni0278.fits
SUN_POSTN:        72.47d {+04h 49m 53s}  +22.46d {+22d 27' 32"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.84d {+01h 31m 22s}  +11.63d {+11d 37' 52"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 04 Jun 13 07:08:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     557354,   Seg_Num: 0
POINT_RA:        250.077d {+16h 40m 19s} (J2000)
POINT_DEC:       +68.211d {+68d 12' 39"} (J2000)
ROLL:            357.786d
IMG_START_DATE:  16447 TJD;   155 DOY;   13/06/04
IMG_START_TIME:  25134.22 SOD {06:58:54.22} UT,   267.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     392021944
X_OFFSET:        1027 [pixels]
Y_OFFSET:        1105 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1187
Y_GRB_POS:       1265
BINNING_INDEX:   1
IM_URL:          sw00557354000msuni0278.fits
SUN_POSTN:        72.47d {+04h 49m 53s}  +22.46d {+22d 27' 32"}
SUN_DIST:         89.34 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       22.84d {+01h 31m 22s}  +11.63d {+11d 37' 54"}
MOON_DIST:        93.44 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:       99.92, 37.03 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      158.75, 82.20 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #14752
A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), C. Gronwall (PSU), C. B. Markwardt (NASA/GSFC), C. Pagani (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 06:54:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130604A (trigger=557354). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 250.080, +68.210 which is
```
   RA(J2000) = 16h 40m 19s
   Dec(J2000) = +68d 12' 36"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked FRED-like structure with a duration of about 70 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 06:56:06.2 UT, 99.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 250.1889, 68.2260 which is equivalent to:
```
   RA(J2000)  = 16h 40m 45.34s
   Dec(J2000) = +68d 13' 33.6"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 156 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.70 x 10^20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 1.76e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT data are not available at this time. Analysis is awaiting the full data set.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #14753
D. A. Perley (Caltech) reports on behalf of a larger collaboration:
The Palomar 60-inch telescope responded automatically to GRB 130604A (Melandri et al., GCN 14752) and began a series of images at 06:58:16 UT, three minutes after the alert notice. We detect a faint (~20 mag) source near the center of the XRT error circle in the initial 60-second r-band and i-band exposures. It is not clearly detected in z-band. The coordinates of the optical transient candidate are:
```
RA  = 16:40:45.290
DEC = +68:13:33.58
(+/- 0.9", J2000)
```
Observations are continuing.
GCN Circular #14754
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
We observed the afterglow of GRB 130604A (Melandri et al., GCN 14752) with the 0.76-m Katzman Automatic Imaging Telescope (KAIT) located at Lick Observatory. Observations started at 06:57:07 UT, 161 s after the burst, with an automatic sequence in V, I, and clear filters (20 s exposure for each image). We do not detect the afterglow at the position reported by Perley (GCN 14753). We estimate the limiting magnitude in our first clear-band (close to R) image to be about 18.5 at a time of 330 s after the burst.
Continuing observations are in progress.
GCN Circular #14756
L. Elenin (KIAM), V. Savanevych (KNURE), A. Bryukhovetskiy (NSFCTC), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed of the field of the Swift GRB 130604A (Melandri et al., GCN 14752) with 0.45-m telescope of ISON-NM observatory on June. 04 (UT) 06:56:11, i.e. 105 s after burst trigger. Series of 30 s and 60 s exposures were obtained in clear filter. In the combined image of the first 3 images we do not detect afterglow candidate (Perley, GCB 14753). Preliminary photometry is based on the USNO-B1.0 (R2) nearby stars:
```
UT start,      T0+        Exposure,  OT,              UL (3 sigma)
                   days      s

06:56:11       0.0019  3x30           n/d              19.7
```
GCN Circular #14758
L. Elenin (KIAM), V. Savanevych (KNURE), A. Bryukhovetskiy (NSFCTC), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
After further inspection of images after observation of the Swift GRB 130604A (Melandri et al., GCN 14752) with 0.45-m telescope of ISON-NM (Elenin, et al., GCN 14756) we identified faint object (S/N ~ 3) in coordinates (J2000) 16 40 45.34 +68 13 34.5 with uncertainty of 0.2" (in both coordinates). Within errors this position coincides with the afterglow candidate (Perley, GCB 14753) and the error circle of XRT reported by Melandri et al. (GCN 14752). This object is not detected in our later combined images and can be the afterglow of GRB 130604A. Preliminary photometry of our images obtained in clear filter is based on USNO-B1.0 (R2) nearby stars:
```
UT start,      T0+          Exposure,  OT,                 UL (3 sigma)
                   mid,days  s

06:56:11       0.0019    3x30           n/d                  19.7
06:56:11       0.0035    9x30           20.3 +/- 0.3      20.0
06:56:11       0.0091  30x30           n/d                  20.5
06:56:11       0.0171  60x30           n/d                  20.8
```
Finding chart can be found at http://grb.rssi.ru/GRB130604A/GRB130604A_ISON_NM_9x30.png
GCN Circular #14760
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 130604A (Melandri et al., GCNC 14752) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2013-06-04 11:52:48 UT (~5.0 h after the burst). We could not detect the previously reported afterglow (Perley, GCNC 14753; Elenin et al., GCNC 14758) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC 2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.24913    12:53:10    6360.0   >20.3  >20.2  >19.5
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14762
S. B. Cenko (GSFC), D. A Perley (Caltech), A. J. Levan (U. Warwick), and A. Cucchiara (UCSC / Lick) report on behalf of a larger collaboration:
We have obtained optical spectra of the afterglow (Perley et al., GCN 14753) of GRB 130604A (Melandri et al., GCN 14752) with the Gemini Multi-Object Spectrograph mounted on the 8 m Gemini North telescope. Observations began at 8:16 UT on 2013 June 4 (~ 1.3 hr after the Swift trigger) and cover the wavelength range from 4000 - 8000 A.
Superimposed on a faint continuum, we detect a single bright emission line at an observed wavelength of ~ 7674.0 A. There is some evidence the emission line is spectrally resolved. No other obvious features (in emission or absorption) are detected over our wavelength range. If we assume this feature corresponds to [O II], this implies a redshift of z = 1.06 for GRB 130604A.
GCN Circular #14763
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 832 s of XRT Photon Counting mode data and 2 UVOT images for GRB 130604A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 250.18823, +68.22651 which is equivalent to:
```
RA (J2000): 16h 40m 45.18s
Dec (J2000): +68d 13' 35.4"
```
with an uncertainty of 2.1 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #14766
M.C. Stroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU) and A. Melandri report on behalf of the Swift-XRT team:
We have analysed 5.7 ks of XRT data for GRB 130604A (Melandri et al. GCN Circ. 14752), from 105 s to 21.8 ks after the BAT trigger. The data comprise 146 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 14763).
The light curve can be modelled with a power-law decay with a decay index of alpha=2.02 (+0.08, -0.06).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.10 (+0.13, -0.12). The best-fitting absorption column is 2.8 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 4.7 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.1 (+/-0.3) and a best-fitting absorption column of 2.2 (+1.0, -0.9) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+1.0, -0.9) x 10^21 cm^-2
Galactic foreground: 4.7 x 10^20 cm^-2
Excess significance: 3.3 sigma
Photon index:	     2.1 (+/-0.3)
```
If the light curve continues to decay with a power-law decay index of 2.02, the count rate at T+24 hours will be 5.8 x 10^-5 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-15 (3.5 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00557354.
This circular is an official product of the Swift-XRT team.
GCN Circular #14768
A. A. Breeveld (MSSL-UCL) and A. Melandri (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130604A 109 s after the BAT trigger (Melandri et al., GCN Circ. 14752). No optical afterglow consistent with the optical position (Perley, GCN Circ. 14753) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           109          258          147         >20.4
white              109        17767         1345         >21.8
v                 5004        11999         1055         >20.3
b                 4388        16933         1278         >21.5
u                  267         5818          378         >20.0
w1                5414         5613          197         >20.0
m2                5208         5408          197         >19.7
w2                4798        11112         1082         >21.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14779
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 130604A (trigger #557354) (Melandri, et al., GCN Circ. 14752). The BAT ground-calculated position is RA, Dec = 250.166, 68.225 deg, which is
```
   RA(J2000)  =  16h 40m 39.9s 
   Dec(J2000) = +68d 13' 28.4" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 81%.
The mask-weighted light curve shows a FRED-like peak starting at ~T-1 sec, peaking at ~T+10 sec, and ending at ~T+90 sec. T90 (15-350 keV) is 37.7 +- 4.6 sec (estimated error including systematics).
The time-averaged spectrum from T-0.44 to T+43.58 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.51 +- 0.12. The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+14.39 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/557354/BA/
GCN Report 443.1
GCN_Report 443.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_443_1.pdf by A. Melandri at INAF-OAB titled: "Swift Observations of GRB 130604A"

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Jochen Greiner, last update: 06-Jun-2013 [Disclaimer]